A common muslim term correlating to the piles of hair left behind in common sink and bathroom drains, left behind by their copious amounts of hair on their head and body, or lack thereof. Grungier types may use it for practical jokes, such as gluing it to theirs and others faces, acting like a ninja.

I went over Ali's house the other day, and saw the most disgusting jarouche left behind in his bathtub. You should have seen the look on his face when I ran out and threw it on his face!